No safety or reset. The problem is likely to be a bad connection somewhere inside the jigsaw or dust around/inside the trigger assembly. If it is new or recently purchased, seek a replacement. If out of warranty, you could try disassembling it and checking for loose wires, or using an appropriate multi-meter to check where the current is absent and go from there.

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There are a couple problems that could cause this. First is the trigger switch which could be worn out or have a short. The second and more common one is that the motor brushes are worn out. After a long period of use these little blocks that look like black steel blocks on springs are what rub on the rotor and they wear out. These are not steel but special high carbon blocks that are easily replaced and cost effective. Remove the housing and near the rear of the motor assembly you will find the brushes in two square holes on either side of the motor. Remove them (be sure it is unplugged) and replace them with new ones. They can be ordered directly from Bosch or from a host of suppliers on the internet.

The socket-head screw that holds the sole plate on is also the alignment screw. Loosen it a little and the sole plate will swivel left and right. There are graduation marks on the base to help with alignment but I always use a square to verify the alignment. Tighten the screw and check again that it didn't move and you are ready to go.

It takes a couple of minutes for the gun to heat up. When you first plug it in, touch the metal nozzle with your hand. It should become obviously hot within 15 seconds and too hot to touch within a minute . After it fully heats up (a couple of minutes), squeezing the trigger should advance the glue stick and push molten glue out of the nozzle. However, there is often an initial resistance to the trigger and you may have to squeeze a bit hard to get it started. If there is a problem with the trigger mechanism, you can also advance the glue by pushing directly on the back end of the glue stick with your thumb.
Good luck.

I am afraid that is how they work even electric ones wont start unless you squeeze the trigger ,once they are running you should be ablr to release the trigger , and then squeeze it again whilst running . if yours dies when you release the trgger while motor is running -----good chance you are working at too high pressure. but to start you have to release all the internal pressure

The problem is the switch, or trigger switch. It may just have saw dust in it or it may be shot. Try blowing the dust out of it with a good blast of compressed air. If you don't have a compressor to do this go to a tire shop. They will help u.